Burned area
satellite only2,768ha
Perimeter published by GWIS (Copernicus).
- Source
- GWIS (Copernicus)
- Date
- 29 Dec 2025 – 12 Jan 2026
+− cross-check
No official record is matched to this page to compare it with.
KH · Cambodia · –
Svay Leu fire, December 2025 Svay Leu
Out · last detection 12 Jan 2026, 06:53 UTC
The fire started on 29 December 2025 in Svay Leu, Cambodia, and satellites saw it burning for 15 days. Copernicus’s global GWIS system rebuilt a burnt perimeter of 2,768 hectares from heat detections, spread across a single municipality.
Number 8 in Cambodia in 2025, of 9.
GWIS near-real-time perimeter, from the layer that changed in October 2025: this fire is not compared with fires from earlier years, because since then the GWIS layer gives more and larger perimeters.
The power measured by the satellite is low (15.2 MW in the strongest hotspot), more typical of grass or stubble burning, or a slow surface fire, than of a large crown fire.
Use this data
Compare with…
Use this data
Fire page data · version 2026-10-27matches the official recordwith caveatssatellite onlymodel
When copying, the sentence is
Tick the figures you want: they make up the lede and the CSV.
Duration by satellite
satellite only15days
29 Dec 2025 to 12 Jan 2026: first and last day with fire on the page.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- last detection: 12 Jan 2026, 06:53 UTC
+− cross-check
Satellites pass a few times a day and cloud or smoke can hide the fire: a lack of detections is not an official extinction. Each country’s emergency service declares a fire contained or out.
Start
satellite only29 Dec 2025
First day with fire seen by the satellites or the perimeter.
- Source
- GWIS (Copernicus) · NASA FIRMS · VIIRS
- Date
- 29 Dec 2025
+− cross-check
No official record is matched to this page, so the alert time and the cause are not known here.
Hotspots
satellite only48
VIIRS detections at 375 m. Most intense hotspot: 15 MW.
- Source
- NASA FIRMS · VIIRS (Suomi NPP)
- Date
- 29 Dec 2025 – 12 Jan 2026
+− cross-check
There is no official record to compare with. Each hotspot is a pixel detected in one satellite pass, not a separate fire.
The worst day
satellite only122MW
Total radiative power on 2 January 2026; hotspots that day: 18.
- Source
- NASA FIRMS · VIIRS (FRP)
- Date
- 2 Jan 2026
+− cross-check
Fire radiative power (FRP) measures the energy the fire gives off when the satellite passes. Added up by day, it compares intensity, not area.
Danger at the start
model14.9FWI · moderate
Fire Weather Index (Canadian system) computed by WorldFires for the day the fire started. Consecutive days without rain before: 18.
- Source
- WorldFires calculation (Canadian FWI system)
- Date
- 29 Dec 2025, local noon
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
This is an index computed from weather model data, not a measurement of the fire nor an official warning. Danger warnings are issued by each country’s authority. Emergency number and official warnings
Weather during the fire
model31.2°C · 42% RH
High of 31.2 °C and minimum humidity of 42% on 5 January 2026; gusts of 36 km/h on 7 January 2026.
- Source
- weather model at the fire’s grid cell
- Date
- 29 Dec 2025 – 12 Jan 2026
- Model
- ERA5 0,25° (ECMWF · Copernicus C3S) · Open-Meteo.com
+− cross-check
These are model values for a cell of about 25 km, not from a weather station: they may differ from what was measured on the ground.
This page’s change log has been kept since 24 October 2026: every night what it publishes is compared and the difference is logged. Anything earlier is reconstructed from each source’s date and marked as reconstructed.
Show
-
· reconstructed weatherWeather and FWI computed from the ERA5 reanalysis
-
logLast day with fire: 5 January 2026 → 12 January 2026.
-
logStart date: 30 December 2025 → 29 December 2025.
-
· reconstructed GHSLPopulation and built-up area computed
What was saved on 27 October 2026
Every night a snapshot of what the page shows is saved. If anything changes, it appears in the list as a log entry.
- Area
- 2,768 ha
- Dates
- 29 Dec 2025 – 12 Jan 2026
- Name
- Svay Leu
- Official record
- —
Versioned permanent link
https://worldfires.org/en/fire/svay-leu-2025-12?v=2026-10-27A version keeps the area, dates, name and official record; the area as it was logged (changes under 2% are not logged). The map, hotspots and weather always show today’s data.
Citation
A lede of about 60 words figures only, no adjectives
CSV for this fire svay-leu-2025-12.csv · daily, no individual hotspots
| fecha | focos_viirs | frp_mw | tmax_c | tmin_c | hr_min_pct | viento_max_kmh | racha_max_kmh | precip_mm | fwi | clase_fwi | dentro_del_incendio |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2025-12-29 | 4 | 16 | 30.7 | 18 | 47 | 9.2 | 24.8 | 0 | 14.9 | moderado | 1 |
| 2025-12-30 | 1 | 3 | 30.1 | 17.5 | 45 | 8.6 | 24.8 | 0 | 15 | moderado | 1 |
| 2025-12-31 | 0 | 0 | 30.6 | 18.2 | 44 | 6.1 | 22 | 0 | 14.2 | moderado | 1 |
| 2026-01-01 | 0 | 0 | 31.1 | 18.6 | 42 | 7.9 | 23.4 | 0 | 15.8 | moderado | 1 |
| 2026-01-02 | 18 | 122 | 30.9 | 17.6 | 39 | 10.7 | 26.3 | 0 | 18.3 | moderado | 1 |
| 2026-01-03 | 4 | 12 | 29.2 | 17.9 | 45 | 10.9 | 30.2 | 0 | 18.8 | moderado | 1 |
| 2026-01-04 | 13 | 122 | 30.2 | 17 | 43 | 10.4 | 27.7 | 0 | 18.9 | moderado | 1 |
| 2026-01-05 | 1 | 4 | 31.2 | 17.4 | 42 | 9.3 | 22 | 0 | 18.7 | moderado | 1 |
| 2026-01-06 | 0 | 0 | 29.9 | 18.1 | 47 | 16.3 | 34.6 | 0 | 22.7 | alto | 1 |
| 2026-01-07 | 2 | 17 | 28.5 | 18.7 | 48 | 15.5 | 36 | 0 | 21.7 | alto | 1 |
| 2026-01-08 | 1 | 2 | 26.8 | 16.5 | 45 | 14.1 | 34.2 | 0 | 21.3 | moderado | 1 |
| 2026-01-09 | 0 | 0 | 26.8 | 14.2 | 46 | 12.9 | 28.4 | 0 | 20.7 | moderado | 1 |
| 2026-01-10 | 0 | 0 | 27.7 | 12.8 | 41 | 9.6 | 22.3 | 0 | 19.3 | moderado | 1 |
| 2026-01-11 | 2 | 12 | 28.2 | 14.6 | 43 | 10.5 | 27.7 | 0 | 20.1 | moderado | 1 |
| 2026-01-12 | 2 | 9 | 29.7 | 15.7 | 45 | 9.2 | 20.5 | 0 | 19.7 | moderado | 1 |
| 2026-01-13 | 0 | 0 | 30.8 | 17.4 | 44 | 8.6 | 24.8 | 0 | 19.7 | moderado | 0 |
| 2026-01-14 | 0 | 0 | 32 | 17.5 | 44 | 7.4 | 22.7 | 0 | 19.4 | moderado | 0 |
| 2026-01-15 | 0 | 0 | 32.7 | 19.4 | 43 | 6.6 | 22 | 0 | 19.3 | moderado | 0 |
| 2026-01-16 | 0 | 0 | 33 | 20.5 | 43 | 6.4 | 20.5 | 0 | 19.5 | moderado | 0 |
| 2026-01-17 | 0 | 0 | 33.5 | 19.5 | 41 | 5 | 15.8 | 0 | 19.1 | moderado | 0 |
| 2026-01-18 | 0 | 0 | 33 | 20.6 | 42 | 6.9 | 18.7 | 0 | 20.4 | moderado | 0 |
| 2026-01-19 | 0 | 0 | 32.1 | 21.8 | 45 | 7.1 | 19.8 | 0.4 | 20.7 | moderado | 0 |
| 2026-01-20 | 0 | 0 | 32.9 | 20.4 | 42 | 6.9 | 19.1 | 0 | 20.9 | moderado | 0 |
| 2026-01-21 | 0 | 0 | 31.6 | 19.5 | 41 | 10.4 | 27 | 0 | 23.2 | alto | 0 |
| 2026-01-22 | 0 | 0 | 30.9 | 18.1 | 37 | 12 | 29.2 | 0 | 24.6 | alto | 0 |
It is generated in your browser from this page’s data: one file per fire, aggregated by day and without individual hotspots.
Live widget for your story
It updates itself while the fire is still active and links to this page. Free, with the attribution shown at the bottom.
Sources for this page: GWIS (Copernicus), NASA FIRMS (VIIRS), ERA5 (ECMWF/Copernicus C3S) · Open-Meteo.com (CC BY 4.0), GHSL (JRC). Open-Meteo.com · How we build fire pages: methodology
- Burnt area
- 2,768ha
- GWIS perimeter (Copernicus)
- Duration
- 15days
- 29 Dec 2025 – 12 Jan 2026
- Municipalities hit
- 1
- districts
- Started on
- 29 Dec
- 2025
- Heat detections
- 48
- in a single hotspot: 15 MW
- Danger at start
- 15
- Moderate · FWI index
- Average daily power
- 32MW
- detected power per day, on average
Where it burned
HOTSPOTS BY DAY
29 Dec12 Jan
12 Jan 2026
How it evolved, day by day
29 Dec
2 Jan
4 Jan
7 Jan
11 Jan
Fire radiative power detected each day, in megawatts, and number of hotspots. The magenta bar marks the peak day.
The weather it burned in
31°high
36km/h · peak gust
39%lowest humidity
It had gone 18 days without rain (1 mm or more) when it started.
This area had burned before
100% of the perimeter overlaps earlier fires recorded since 2016: 1,474 ha in 2016, 1,240 ha in 2017, 1,705 ha in 2018, 2,854 ha in 2019, 1,621 ha in 2020, 23 ha in 2021, 1,442 ha in 2022. Part of it burned more than once, so the yearly figures add up to more than the 2,784 ha that had burned before.
- 2,594 ha Svay Leu fire, December 2019 11,004 ha in total; the hectares shown are those it shares with this fire
- 1,686 ha Svay Leu fire, December 2018 2,721 ha in total; the hectares shown are those it shares with this fire
- 1,621 ha Svay Leu fire, December 2020 2,397 ha in total; the hectares shown are those it shares with this fire
- 1,442 ha Svay Leu fire, January 2022 2,063 ha in total; the hectares shown are those it shares with this fire
- 238 ha Svay Leu fire, January 2017 4,561 ha in total; the hectares shown are those it shares with this fire
How big is it?
London boundary: geoBoundaries · Office for National Statistics (Open Government Licence v3.0).
Paris boundary: geoBoundaries · Institut national de l'information géographique et forestière (IGN-F) (Etalab Open License 2.0).
Madrid boundary: geoBoundaries · Open Data ESRI, IGN Central Registry of Cartography Area (CC BY 4.0).
Berlin boundary: geoBoundaries · Federal Agency for Cartography and Geodesy (dl-de/by-2-0).
This compares size, not location: both shapes are at the same scale, north up, centred on each other.
What happened to each town
-
Svay Leu where it started2,786 ha reached on 29 Dec1.4 %
Burnt area inside each municipality, from crossing the GWIS perimeter with administrative boundaries. The distance runs from the point marking the centre of each area to the nearest fire: staying a kilometre away does not mean it reached the houses.
People and buildings inside the perimeter
GHSL 2025Built-up area< 0.1 ha
Residents< 20
Inside the perimeter there was no noticeable built-up land and almost nobody lived there (GHSL 2025, satellite-based estimate).
This is an estimate on 100 m cells, made from satellite imagery and census data: it does not mean that homes burned or that anyone was harmed. The perimeter also contains land that never burned. The GHSL 2025 epoch is a projection made from 2020 and earlier data.
Source: Global Human Settlement Layer (GHS-BUILT-S and GHS-POP R2023A), European Commission Joint Research Centre (JRC), © European Union, CC BY 4.0. Sum inside the perimeter computed by WorldFires. human-settlement.emergency.copernicus.eu
The weather day by day
ECMWF ERA5 reanalysis at the fire location, the standard reference for past weather, and the Canadian Fire Weather Index (the same system Copernicus uses), computed by WorldFires from that data. Days after the fire run until the first rain.
Open-Meteo.com (CC BY 4.0) · Copernicus Climate Change Service (ERA5)
| Day | High | Min. humidity | Peak gust | Rain | Danger (FWI) |
|---|---|---|---|---|---|
| 29 Dec | 30.7 °C | 47 % | 25 km/h | 0.0 mm | Moderate 15 |
| 30 Dec | 30.1 °C | 45 % | 25 km/h | 0.0 mm | Moderate 15 |
| 31 Dec | 30.6 °C | 44 % | 22 km/h | 0.0 mm | Moderate 14 |
| 1 Jan | 31.1 °C | 42 % | 23 km/h | 0.0 mm | Moderate 16 |
| 2 Jan | 30.9 °C | 39 % | 26 km/h | 0.0 mm | Moderate 18 |
| 3 Jan | 29.2 °C | 45 % | 30 km/h | 0.0 mm | Moderate 19 |
| 4 Jan | 30.2 °C | 43 % | 28 km/h | 0.0 mm | Moderate 19 |
| 5 Jan | 31.2 °C | 42 % | 22 km/h | 0.0 mm | Moderate 19 |
| 6 Jan | 29.9 °C | 47 % | 35 km/h | 0.0 mm | High 23 |
| 7 Jan | 28.5 °C | 48 % | 36 km/h | 0.0 mm | High 22 |
| 8 Jan | 26.8 °C | 45 % | 34 km/h | 0.0 mm | Moderate 21 |
| 9 Jan | 26.8 °C | 46 % | 28 km/h | 0.0 mm | Moderate 21 |
| 10 Jan | 27.7 °C | 41 % | 22 km/h | 0.0 mm | Moderate 19 |
| 11 Jan | 28.2 °C | 43 % | 28 km/h | 0.0 mm | Moderate 20 |
| 12 Jan | 29.7 °C | 45 % | 20 km/h | 0.0 mm | Moderate 20 |
| 13 Jan after | 30.8 °C | 44 % | 25 km/h | 0.0 mm | Moderate 20 |
| 14 Jan after | 32.0 °C | 44 % | 23 km/h | 0.0 mm | Moderate 19 |
| 15 Jan after | 32.7 °C | 43 % | 22 km/h | 0.0 mm | Moderate 19 |
| 16 Jan after | 33.0 °C | 43 % | 20 km/h | 0.0 mm | Moderate 20 |
| 17 Jan after | 33.5 °C | 41 % | 16 km/h | 0.0 mm | Moderate 19 |
| 18 Jan after | 33.0 °C | 42 % | 19 km/h | 0.0 mm | Moderate 20 |
| 19 Jan after | 32.1 °C | 45 % | 20 km/h | 0.4 mm | Moderate 21 |
| 20 Jan after | 32.9 °C | 42 % | 19 km/h | 0.0 mm | Moderate 21 |
| 21 Jan after | 31.6 °C | 41 % | 27 km/h | 0.0 mm | High 23 |
| 22 Jan after | 30.9 °C | 37 % | 29 km/h | 0.0 mm | High 25 |
Before and after, from space
Drag the line to compare the same ground before the fire and after it.
↔
Before · 22 Dec 2025
After · 19 Jan 2026
Sentinel-2 did not pass over on that day. Try another date, or use false colour, which is daily.
If the day is cloudy, change the date: each satellite passes once a day. In false colour the burnt ground looks brown or red.
The smoke
CAMS · CopernicusOn 30 December 2025 the air beside the fire reached 31 µg/m³ of PM2.5. That day averaged 20: 1.3 times the WHO daily guideline (15).
PM2.5 peak31 µg/m³
Days over the guideline3 days
PM1031 µg/m³
Optical depth0.29
WHO 15
28 Dec31 Dec3 Jan6 Jan
Good
Fair
Moderate
Poor
Very poor
Extremely poor
Particles from the Copernicus CAMS model at the centre of the perimeter; these are not measurements in each town. The pale bar is the worst hour, the solid one the daily average.
Open-Meteo.com (CC BY 4.0) · Copernicus Atmosphere Monitoring Service (CAMS)
Detections table · 48Every satellite heat detection, one by one, with time, satellite, power and coordinates.
⬇ Download CSV
Times in UTC. Each detection is a 375 m pixel: a large fire yields hundreds per pass.
| Date and time | Satellite | FRP (MW) | Lat | Lon |
|---|
Other fires nearby
- 11,004 haSvay Leu18 December 2019 · 31 days · 3 km away
- 4,561 haSvay LeuJanuary 2017 · 20 days · 6 km away
- 4,651 haSvay Leu20 December 2019 · 24 days · 15 km away
- 7,677 haTrapeang PrasatApril 2016 · 25 days · 27 km away
- 8,434 haAnlong Veaeng7 March 2019 · 7 days · 28 km away
- 8,281 haKuleaen7 February 2026 · 15 days · 28 km away
Frequently asked questions
- How long did the Svay Leu fire last?
- According to the heat detections seen by satellite inside the perimeter, it burned from 29 December 2025 to 12 January 2026 (15 days). The perimeter dates it from 30 December 2025 to 5 January 2026.
- How much area did it burn?
- The perimeter GWIS (Copernicus) rebuilt from heat detections is 2,768 hectares (27.7 km²). It is an estimate: official national figures may differ.
- Which municipalities burned?
- The fire only entered Svay Leu (2,786 ha, 1.4 %).
- What was the weather like?
- During the fire the temperature reached 31.2 °C, humidity dropped to 39 % and gusts hit 36 km/h. The fire danger index (FWI) reached 23, class High.
- Where does this data come from?
- From the GWIS (Copernicus) burnt perimeter, NASA FIRMS VIIRS hotspots and the administrative boundaries of Cambodia (geoBoundaries). It is not an official report.
Where to verify it
A satellite detection is not an official report. Final figures and the fire’s status are published by each country’s emergency service.
Satellite cross-check
History of this page · 2 Changes in area, dates, name, official record or merged pages, compared every night since 24 October 2026.
- Last day with fire: 5 January 2026 → 12 January 2026.
- Start date: 30 December 2025 → 29 December 2025.
RSS Changes to this page With cross-checks and a citable version
Does something look wrong on this page?
This page is built from satellite data and official records, and it sometimes gets things wrong: the wrong dates, the wrong town, two fires merged into one, or something that was not a wildfire at all. If you know this fire first-hand (you live nearby, saw it, fought it or reported on it), tell us what really happened and we will check it.
Report an error
How we know this
- Perimeter: GWIS (Copernicus), rebuilt from heat detections rather than mapped on imagery.
- Dates adjusted with the VIIRS detections inside the perimeter, which said 30 December 2025 to 5 January 2026. 48 Suomi-NPP VIIRS detections on those dates.
- We have not matched this page with any official record.
- Weather: Copernicus ERA5 reanalysis at the fire location, in cells of about 25 km.
- Built-up area and population come from the JRC Global Human Settlement Layer (epoch 2025, 100 m cells), summed inside the perimeter: an estimate of what was there, not a damage count.
Where this data comes from
The perimeter comes from the Copernicus Global Wildfire Information System (GWIS), which rebuilds it from MODIS and VIIRS heat detections and publishes it under CC BY 4.0. It is not measured on imagery as in Europe, so it is an estimate. Heat detections come from the VIIRS sensors aboard Suomi-NPP and NOAA-20, distributed by NASA FIRMS at 375 m resolution. Municipal boundaries come from geoBoundaries ADM2 (Creative Commons Attribution 4.0 International (CC BY 4.0)). The area per municipality is computed by WorldFires by crossing the perimeter with those boundaries, so it may differ from each country’s official figure.